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Quarterly Financial Information (Unaudited) (Details) (USD $) Share data in Thousands, except Per Share data, unless otherwise specified | 3 Months Ended | 12 Months Ended
--- | --- | ---
Dec. 31, 2013 | Sep. 30, 2013 | Jun. 30, 2013 | Mar. 31, 2013 | Dec. 31, 2012 | Sep. 30, 2012 | Jun. 30, 2012 | Mar. 31, 2012 | Dec. 31, 2013 | Dec. 31, 2012 | Dec. 31, 2011
Operating revenues | $ 1,184,423,000 | $ 1,285,782,000 | $ 1,060,595,000 | $ 931,604,000 | $ 1,081,144,000 | $ 1,173,518,000 | $ 967,962,000 | $ 852,807,000 | $ 4,462,404,000 |  | $ 4,075,431,000 |  | $ 4,050,492,000 |
Total operating expenses | 1,037,306,000 | 1,135,909,000 | 969,217,000 | 827,073,000 | 1,190,673,000 | 1,207,553,000 | 876,248,000 | 781,750,000 | 3,969,505,000 |  | 4,056,224,000 |  | 3,644,125,000 |
Operating income | 147,117,000 | 149,873,000 | 91,378,000 | 104,531,000 | (109,529,000) | (34,035,000) | 91,714,000 | 71,057,000 | 492,899,000 |  | 19,207,000 |  | 406,367,000 |
Income from continuing operations | 91,348,000 | 84,550,000 | 46,392,000 | 56,592,000 | (69,686,000) | (29,532,000) | 49,007,000 | 35,890,000 | 278,882,000 |  | (14,321,000) |  | 225,952,000 |
Income (loss) from discontinued operations, net of tax | (58,000) | (118,000) | (59,000) | (77,000) | 8,700,000 | (139,000) | 5,106,000 | (100,000) | (312,000) | [1] | 13,567,000 | [1] | (12,926,000) | [1]
Net income (loss) attributable to parent | 91,450,000 | 84,456,000 | 46,512,000 | 56,515,000 | (60,986,000) | (29,671,000) | 54,113,000 | 35,790,000 |  |  |  |  |  |
Earnings (loss) per common share - basic [Abstract] |  |  |  |  |  |  |  |  |  |  |  |  |  |
Earnings before discontinued operations | $ 0.48 | $ 0.45 | $ 0.25 | $ 0.30 | $ (0.37) | $ (0.16) | $ 0.26 | $ 0.19 | $ 1.47 |  | $ (0.08) |  | $ 1.19 |
Discontinued operations, net of tax | $ 0.00 | $ 0.00 | $ 0.00 | $ 0.00 | $ 0.05 | $ 0.00 | $ 0.03 | $ 0.00 | $ 0.00 |  | $ 0.07 |  | $ (0.07) |
Earnings (loss) per common share - basic | $ 0.48 | $ 0.45 | $ 0.25 | $ 0.30 | $ (0.32) | $ (0.16) | $ 0.29 | $ 0.19 | $ 1.47 |  | $ (0.01) |  | $ 1.12 |
Earnings per common share - diluted [Abstract] |  |  |  |  |  |  |  |  |  |  |  |  |  |
Earnings before discontinued operations | $ 0.48 | $ 0.44 | $ 0.24 | $ 0.30 | $ (0.37) | $ (0.16) | $ 0.26 | $ 0.19 | $ 1.47 |  | $ (0.08) |  | $ 1.19 |
Discontinued operations, net of tax | $ 0.00 | $ 0.00 | $ 0.00 | $ 0.00 | $ 0.05 | $ 0.00 | $ 0.03 | $ 0.00 | $ 0.00 |  | $ 0.07 |  | $ (0.07) |
Earnings (loss) per common share - diluted | $ 0.48 | $ 0.44 | $ 0.24 | $ 0.30 | $ (0.32) | $ (0.16) | $ 0.29 | $ 0.19 | $ 1.47 |  | $ (0.01) |  | $ 1.12 |
Weighted average common shares outstanding - basic | 188,929 | 188,831 | 188,831 | 188,831 | 188,831 | 188,831 | 188,831 | 188,811 | 188,855 |  | 188,826 |  | 188,763 |
Weighted average common shares outstanding - diluted | 189,766 | 189,638 | 189,463 | 189,222 | 188,831 | 188,831 | 189,107 | 189,182 | 189,693 |  | 188,826 |  | 188,905 |
Unrealized gain (loss) on commodity derivatives | (500,000) | (7,900,000) | 8,200,000 | (3,700,000) | (200,000) | (700,000) | 3,000,000 | (2,600,000) |  |  |  |  |  |
Asset impairment charges |  |  | 9,000,000 |  |  |  | 1,700,000 |  | 9,000,000 |  | 1,700,000 |  |  |
Reversal of an arbitration charge after tax | 1,500,000 |  |  |  | 13,000,000 |  | 15,000,000 |  | 1,500,000 |  | 15,000,000 |  |  |
Noncash write-downs of oil and natural gas properties, after tax |  |  |  |  | $ 145,900,000 | $ 100,900,000 |  |  |  |  | $ 246,800,000 |  |  |
[1] | Reflected in the Other category.

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- Definition Number of [basic] shares or units, after adjustment for contingently issuable shares or units and other shares or units not deemed outstanding, determined by relating the portion of time within a reporting period that common shares or units have been outstanding to the total time in that period. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 260 -SubTopic 10 -Section 50 -Paragraph 1 -Subparagraph (a) -URI http://asc.fasb.org/extlink&oid=6371337&loc=d3e3550-109257 Reference 2: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 260 -SubTopic 10 -Section 45 -Paragraph 10 -URI http://asc.fasb.org/extlink&oid=7655603&loc=d3e1448-109256 Reference 3: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Glossary Weighted-Average Number of Common Shares Outstanding -URI http://asc.fasb.org/extlink&oid=6528421 + Details
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